#div_main {
    margin: 0 auto;
    width: 300px;
    height: 400px;
    border: 1px solid black;
    margin-top: 50px;
}

#div_txt {
    position: relative;
    width: 200px;
    margin: 0 auto;
    margin-top: 40px;
}

#txt1 {
    width: 99%;
}

#div_items {
    position: relative;
    width: 100%;
    height: 200px;
    border: 1px solid #66afe9;
    border-top: 0px;
    overflow: auto;
    display: none;
}

.div_item {
    width: 100%;
    height: 20px;
    margin-top: 1px;
    font-size: 13px;
    line-height: 20px;
}